The hyperfine structure of the two multiplets 4d 4 5s 6D and 4d 3 5s 2 4F of 93Nb has been studied by the atomic-beam magnetic-resonance method. After applying corrections due to effects of off-diagonal hyperfine and Zeeman interactions the hyperfine interaction constants A and B and the electron g factors gj are determined for all nine levels of the two multiplets.

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The atomic-beam magnetic-resonance method in combination with the triple resonance technique has been used to determine the nuclear magnetic dipole moments of 99Ru and l~The moments are deduced from rf transition measurements in the 5F s and 5F 4 states at magnetic fields between 770 and 2400 Oe. In order to reduce the part of the uncertainty of the moments which arises from the uncertainty of the hyperfine structure constants more precise values of the constants than those available up to now were determined from low field measurements. After making corrections for hyperfine and Zeeman interactions with neighbouring atomic states we obtain the following values for the magnetic dipole moments:

The 5d76s 2 4F9/2 atomic ground state of 191Ir and 193Ir has been studied using the atomic-beam magnetic-resonance method. The results are:

Using the atomic beam magnetic resonance method the experimental hyperfine structure data of the 5d 2 6s 2 3F 2 ground state of i77Hf and 179I-If described in a previous paper [1] have been completed. After applying corrections due to perturbations by other fine structure levels of the configuration 5d 2 6s 2 we got the following multipole interaction constants: By measuring rf transitions at magnetic fields between 1100 and 1550 Gauss the nuclear ground state magnetic dipole moments were determined. The results are:/tz(i77Hf) = 0.7836 (6)/tN, pi(i79Hf)= --0.6329 (13) #/r (uncorrected for diamagnetic shielding).